(gamma,np) reactions in ¹²C , ⁶Li and ^3,4He

The emission of neutron-proton pairs is the most probable outcome of photon absorbtion in the energy region above the giant resonance at least up to the pion threshold, but little detailed information on the process has been obtained due to experimental difficulties. Two nucleon emission following photon absorbtion by a correlated pair is favoured compared to direct knockout of a single nucleon, which is suppressed by the large momentum mismatch between the ingoing photon and a single outgoing fast nucleon. Studies of the (gamma,np) process seek firstly to obtain a quantitative understanding of the photon interaction mechanism, and through this to open the door to investigations of nucleon correlations in nuclei [1], information about which is long sought but not readily obtainable

Relativistic corrections in (gamma,N) knockout reactions

We develop a fully relativistic DWIA model for photonuclear reactions using the relativistic mean field theory for the bound state and the Pauli reduction of the scattering state which is calculated from a relativistic optical potential. Results for the 12C(gamma,p) and 16O(gamma,p) differential cross sections and photon asymmetries are displayed in a photon energy range between 60 and 257 MeV, and compared with nonrelativistic DWIA calculations. The effects of the spinor distortion and of the effective momentum approximation for the scattering state are discussed. The sensitivity of the model to different prescriptions for the one-body current operator is investigated. The off-shell ambiguities are large in (gamma,p) calculations, and even larger in (gamma,n) knockout.Comment: LaTeX2e, 18 pages, and 6 figure

Micromachining using deep ion beam lithography

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms1301-4155-159NIMB

Deep ion beam lithography for micromachining applications

10.1117/12.280533Proceedings of SPIE - The International Society for Optical Engineering3183128-137PSIS

A high resolution beam scanning system for deep ion beam lithography

Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms136-138385-389NIMB

Direct synthesis of L10-phase nanostructured CoPt thin films using dense plasma focus device operating in non-optimized focus mode

Materials Research Society Symposium Proceedings1250113-118MRSP

On the plume splitting of pulsed laser ablated Fe and Al plasmas

A time resolved imaging study of pulsed laser ablated Fe and Al plasma plumes with specific interest in the splitting of plumes into the slow and fast moving components as they expand through the background argon gas at different pressures is reported. The material ablation was achieved using a Q-switched Nd:YAG (yttrium aluminum garnet) laser operating at 532 nm with a pulse duration of ~ 8ns full width at half maximum and a fluence of 30 µJ.cm-2 at the target surface. Typical time resolved images with low magnification show that the splitting occurs at moderate background gas pressures (0.5 and 1.0 mbar for Fe, and 0.2 mbar for Al plasma plumes). The plume splitting did not occur for higher background gas pressures

Miniature plasma focus as a novel device for synthesis of soft magnetic FeCo thin films

10.1016/j.physleta.2009.12.037Physics Letters, Section A: General, Atomic and Solid State Physics37481043-1048PYLA